Installation Instructions
IMPORTANT
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FLEX I/O™ Very High Speed Counter
Cat. No. 1794-VHSC
This module must be used with 1794-ACN15 or 1794-ACNR15
Series B or later ControlNet adapters in ControlNet systems.
Important User Information
Solid state equipment has operational characteristics differing from those of
electromechanical equipment. Safety Guidelines for the Application, Installation and
Maintenance of Solid State Controls (Publication
Rockwell Automation sales office or online at
http://www.rockwellautomation.com/literature) describes some important differences
between solid state equipment and hard-wired electromechanical devices. Because of
this difference, and also because of the wide variety of uses for solid state equipment,
all persons responsible for applying this equipment must satisfy themselves that each
intended application of this equipment is acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or
consequential damages resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes.
Because of the many variables and requirements associated with any particular
installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual
use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of
information, circuits, equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written
permission of Rockwell Automation, Inc. is prohibited.
Throughout this manual we use notes to make you aware of safety considerations.
Identifies information about practices or circumstances that can
cause an explosion in a hazardous environment, which may lead to
personal injury or death, property damage, or economic loss.
SGI-1.1 available from your local
FLEX I/O is grounded through the DIN rail to chassis ground. Use zinc
plated yellow-chromate steel DIN rail to assure proper grounding. The use
of other DIN rail materials (for example, aluminum or plastic) that can
corrode, oxidize, or are poor conductors, can result in improper or
intermittent grounding. Secure DIN rail to mounting surface approximately
every 200
mm (7.8 in.) and use end-anchors appropriately.
Prevent Electrostatic Discharge
This equipment is sensitive to electrostatic discharge, which can cause
internal damage and affect normal operation. Follow these guidelines
when you handle this equipment:
• Touch a grounded object to discharge potential static.
• Wear an approved grounding wriststrap.
• Do not touch connectors or pins on component boards.
• Do not touch circuit components inside the equipment.
• Use a static-safe workstation, if available.
• Store the equipment in appropriate static-safe packaging when not
in use.
If multiple power sources are used, do not exceed the specified isolation
voltage.
Do not remove or replace a Terminal Base unit while power is applied.
Interruption of the backplane can result in unintentional operation or
machine motion.
Identifies information that is critical for successful application and
understanding of the product.
Identifies information about practices or circumstances that can lead
to personal injury or death, property damage, or economic loss.
Attentions help you identify a hazard, avoid a hazard, or recognize the
consequence
Install Your Very High Speed Counter Module
Environment and Enclosure
This equipment is intended for use in a Pollution Degree 2 industrial
environment, in overvoltage Category II applications (as defined in IEC
60664-1), at altitudes up to 2000 m (6562 ft) without derating.
This equipment is considered Group 1, Class A industrial equipment
according to IEC/CISPR 11. Without appropriate precautions, there may be
difficulties with electromagnetic compatibility in residential and other
environments due to conducted and radiated disturbances.
This equipment is supplied as open-type equipment. It must be mounted
within an enclosure that is suitably designed for those specific
environmental conditions that will be present and appropriately designed
to prevent personal injury resulting from accessibility to live parts. The
enclosure must have suitable flame-retardant properties to prevent or
minimize the spread of flame, complying with a flame spread rating of
5VA, V2, V1, V0 (or equivalent) if non-metallic. The interior of the
enclosure must be accessible only by the use of a tool. Subsequent
sections of this publication may contain additional information regarding
specific enclosure type ratings that are required to comply with certain
product safety certifications.
During mounting of all devices, be sure that all debris (metal chips, wire
strands, and so on) is kept from falling into the module. Debris that falls
into the module could cause damage on power up.
In addition to this publication, see:
• Industrial Automation Wiring and Grounding Guidelines, publication
1770-4.1, for additional installation requirements
• NEMA Standard 250 and IEC 60529, as applicable, for explanations
of the degrees of protection provided by enclosures
The module mounts on a 1794-TB3G or 1794-TB3GS terminal base.
1. Rotate the keyswitch (3) on the terminal base (4) clockwise to position 1 as
required for this type of module.
Publication 1794-IN067C-EN-P - January 2012
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2. Make certain the FlexBus connector (1) is pushed all the way to the left to
connect with the neighboring terminal base/adapter. You cannot install
the module unless the connector is fully extended.
3. Make sure the pins on the bottom of the module are straight so they will
align properly with the connector in the terminal base.
4. Position the module (7) with its alignment bar (6) aligned with the groove
(5) on the terminal base.
5. Press firmly and evenly to seat the module in the ter minal base unit. The
module is seated when the latching mechanism (2) is locked into the
module.
Connecting Wiring for the 1794-TB3G, and 1794-TB3GS
To reduce susceptibility to noise, power analog modules and
digital modules from separate power supplies. Do not exceed a
length of 3
m (9.8 ft) for DC power cabling.
Do not daisychain power or ground from this terminal base unit
to any AC or DC digital module terminal base units.
Do not wire more than two conductors on any single terminal.
Wiring Connections Using 1794-TB3G and 1794-TB3GS
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
AA BZBZO0 O1 O2 O3
24V Inputs
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
16
Chassis
AA BZBZ
Gnd
5V Inputs 5V Inputs
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
34
+24V DC COM
A, A = incremental encoder input A (+5 or +24V DC)
B, B = incremental encoder input B (+5 or +24V DC)
Z, Z = incremental encoder input Z (+5 or +24V DC)
O = sourcing outputs
Input power for Output O0 (A-6); Output O1 (A-7) - C-37 (+) and C-39 (-)
Input power for Output O2 (A-14); Output O3 (A-14) - C-46 (+) and C-48 (-)
R = returns for sourcing outputs
+V = +5 or +24V DC isolated power externally supplied for outputs (1A max)
-V = negative isolated power connection (1A max)
+24V DC= 24V DC terminal base power for module
COM = return for 24V DC terminal base power for module
Chassis Gnd = chassis ground for input or output cable shields
NC = No Connection
Chas
+V -V +V -V
GND
AA BZBZ
24V Inputs
AA BZBZ
R0 R1
Chassis Grounds for Shields
Wiring Connections
Encoder
Inputs
A A-0 B-17 A-8 B-25
A A-1 B-18 A-9 B-26
B A-2 B-19 A-10 B-27
B A-3 B-20 A-11 B-28
Z A-4 B-21 A-12 B-29
Z A-5 B-22 A-13 B-30
Outputs Source Out Return
O0 A-6 B-23
O1 A-7 B-24
O2 A-14 B-31
O3 A-15 B-32
24V DC Terminals C-34 and C-50
24V COM Terminals C-35 and C-51
5 or 24V output power Terminals C-37 and C-46
-V output power Terminals C-39 and C-48
Chassis Ground Terminals B-16, B-33, C-38, C-40…C-45, C-47
Channel 0 Channel 1
24V
Inputs
5V
Inputs
24V Inputs 5V Inputs
Chas
GND
R2 R3
NCNC
A
+24V DC
Chassis
Gnd
COM
B
C
Publication 1794-IN067C-EN-P - January 2012
Do not connect 24V signals to the +5V input terminals.
Permanent damage to the module will result.
Input Map
Dec. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Oct. 17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0
0 Channel 0 Current Count (least significant word)
1 Channel 0 Current Count (most significant word)
2 Channel 1 Current Count (least significant word)
3 Channel 1 Current Count (most significant word)
4 Channel 0 Stored/Accumulated Count (least significant word)
5 Channel 0 Stored/Accumulated Count (most significant word)
6 Channel 1 Stored/Accumulated Count (least significant word)
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